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Features of silicone seals

by:ORK      2022-10-30
Features of silicone seals Silicone rubber seals have excellent heat resistance, low temperature elasticity, excellent oxidation resistance and ozone resistance. Silicone rubber seals seals are highly breathable and selective. Excellent electrical insulation properties (volume resistance over 10)Ω). Cm, breakdown field strength above 30KV/mm), corona resistance. Electric resistance orphan. But add conductive carbon black, nickel powder, aluminum powder, silver powder (volume resistance can reach 5-0.02Ω) to obtain moderate conductivity. centimeter). The surface of the silicone sealing ring can be used as an insulating material and has low water absorption. Water resistance, but poor water vapor resistance, pressure higher than 50psi is not recommended. Compatible with most oils. Suitable for chemicals and solvents. In general, silica gel has excellent acid and alkali resistance, excellent resistance to polar solvents, but no resistance to alkane hydrogens and aromatic oils. Most concentrated solvents are not recommended. Petroleum products. Should be used for concentrated acids and dilute sodium solutions. Special silica gel also has radiation resistance, fire resistance, oil resistance and other properties. Silicone rubber seals seals have low compressive strength and poor wear resistance, and generally do not require dynamic sealing. The polymer molecule of the silicone sealing ring is a chain-like structure generated by silicon-oxygen bonds, and its main component is a linear polysiloxane with high molar mass. The Si-O-Si key is the basic key type. The silicon atom is bonded to the hydroxyl group and introduces a small amount of unsaturated groups in the side chain. The intermolecular force is small, and the molecule is a helical structure. The hydroxyl groups are arranged outward and can be rotated at will, which makes the silicone rubber sealing ring have better heat resistance, electrical insulation and chemical stability than other ordinary rubbers. A typical silicone sealing ring is polydimethyl methyl methyl methyl methyl methyl methyl siloxane with a helical molecular formula, small intermolecular force and good elasticity. At the same time, the formaldehyde radicals outside the screw can rotate freely. Therefore, silicone seals have unique surface properties, such as hydrophobicity and surface tack resistance. The main component of silicone seals is silicone. The main molecular chain of silica gel consists of the substitution of silicon atoms and oxygen atoms. This is a polymer elastic material with inorganic and organic properties. Hydroxy vinyl silica gel consisting of dimethyl siloxane and a small amount of vinyl siloxane is widely used at present
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